Start with the Water Path
Ice production is a chain: water in through a valve, along a fill tube, into a mold, frozen, then harvested and dropped into the bin. A break anywhere in that chain stops the ice. Because the same components sit behind most failures, a good diagnosis follows the water from the household supply to the harvest sensor. In Colorado's hard water, scale is a recurring factor that slowly chokes valves and coats the evaporator.
Ice-Maker Faults by Cause
| What You Notice | Likely Cause | What It Needs |
|---|---|---|
| No ice, bin empty | Failed inlet valve or frozen fill tube | Valve test, tube thaw, part replacement |
| Small or hollow cubes | Low pressure or partial blockage | Pressure check, valve cleaning |
| Low output | Scale on evaporator | Descale and sanitize |
| Never harvests | Failed thermistor or optic sensor | Sensor test and replacement |
| Water leaking at unit | Cracked inlet or loose fitting | Replace fitting or inlet assembly |
Notes by Brand
Across the roster, ice faults differ in the details. Sub-Zero built-in ice makers most often quit at the inlet valve or a frozen fill tube, and their clear-ice units are sensitive to water quality. Scotsman nugget and gourmet machines depend on regular cleaning and descaling, and low output there usually means scale or a harvest-sensor issue. True Residential and Monogram units commonly trace to the fill valve or a control that stopped calling for a cycle. Thermador and Viking refrigerator ice makers frequently show low pressure and short fills as hollow cubes. The disciplined fix is the same everywhere: verify water, verify the harvest cycle, then replace the specific failed part.
Out of Ice?
Book a diagnosis. Diagnostic and travel fees, if applicable, are confirmed before the appointment and before repair approval.